mauchain



(No Model.) 2 Sheets-Sheet 1.

A. M AUOHAIN.

ADJUsTABLE BAUK.

No. 690,045. Patented Sept. 14,1897.

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(No Model.) 2 Sheds-Sheet 2.

A. MAUOHAIN. ADJUSTABLE BACK.

No. 590,045. Patented Sept. 14.1897,

m: NORRIS PETERS co, PHUTO-LITND., wnwmmou. me,

'arnnr FFIQEQ ARMAND MAUCIIAIN, OF GENEVA, SIVITZERLAND.

ADJUSTABLE BACK.

SPECIFICATION forming part of Letters Patent No. 590,045, datedSeptember 14, 1897'.

Application filed anu ry 28,1897. Serial a. e21.0 00.

(No model.) Patented in Trance April 8, 1895,110. 246,471; inSwitzerland 8ep'ternber 6,1895, No. 10,918; in Germany $eptember 11,1895,

N0. 88,16; in Belgium October 5, 1895, No.

117,739; in Italy October 8, 1895, No. 89,931/223; in England November5, 1895, No. 20,919, and in Austria January many, No. 88,161, datedSeptember 11, 1895;

in Italy, No. 39,931/223, dated October 8, 1895; in Belgium, No.117,739, dated October 5, 1895, and in Great Britain, No. 20,919,

dated November 5, 1895,) of which the fol lowing is a specification.

The object of the invention is to provide a piece of furnituresueh as aseat, chair, sofa, bench, bed, or the likewith a support for the lumbarregioii that is to say, for the part of the spinal column which,beingweaker, is most in need of a support.

In the ordinary seats the backs are very seldom arranged so as to answerthis purpose, and if they are so arranged for persons of a certain sizethey do not answer for persons of a different size or build.

It is of great importance from a hygienic point 01' view to have. thelumbar region well supported, not only 011 account of the rest .thussecured for the person who is sitting down, but also because such personwill necessarily take without fatigue a position in which breathin g canbe more freely performed than when sitting down on a seat unprovidedwith such support.

The above-mentioned purpose is served by what I term a movablelumbar-back, which may be combined with my fixed dorsal back, adapted tobe applied to any piece of furniture used as a seat.

The mobility of the lumbar-back can beobtainedbyvarious means, but itmust be so constructed that the person who is sitting down on the pieceof furniture with which the same is provided may raise or lower the samewithout abandoning his or her sitting position until he or she feels theback to be in the right place forsupporting his or her lumbar region.

In the accompanying drawings I have shown how myinvention maybe carriedinto effect.

Figure 1 is a front elevation of a seat provided with my improvedmovable lumbarback. In this figure the part of the cushion of the seatis broken away in view of showing the construction. Fig. 2 is a verticalsection through the seat shown in Fig. 1.

The construction shown in the figures consists of a chair the seat andback of which are provided with suitable springs andwith a movablelumbar-back the springs of which are stronger than those of the fixedback.

The seat of the chair is formed of a frame A to which the springs B arefixed, the latter being disposed in the direction of the depth of theseat. These springs are covered with a covering or cushion O of suitablethickness, which can be of any suitable stuff whatever and which isfixed to the frame A with the aid of a suitable system of hooks andeyes, as shown at 0 in Fig. 1.

The fixed back of the chair is formed of a frame D to which are fixedthe, springs E in the direction of the breadth of the back, and the saidsprings E are covered with a covering or cushion F which may consist ofany suitable stuff whatever, fixed to the frame D as shown at f in thedrawings.

The cushions C and]? may be easily removed for the purpose of beatingthe same. They may be double-faced, one of the faces being covered overwith warm stuff for winter-time, the other one with leather or oilclothfor the summertime.

The movable lumbar-back consists of;a rigid piece G to which are fixedspringblades 11 which are stronger than the blades E of the back. Acovering in any convenient stuff J X covers the plates I-I and is fixedto the rigid piece G with the aid of hooks and eyes at j in thedrawings.

In the example shown in the drawings the movable lumbar-back is disposedso as to slide into two slots 78, with which the uprights K of the seatare provided. A piece IQi L connected by the hinge to the rigid piece Gand actuated by springs j is provided with tenons V, which engage underthe action of springs j in the racks 75 of the uprights K so as tomaintain the movable lumbar-back up to the height to which it has beenplaced.

By pulling the handle L of the piece L the tenons I of the racks aredisengaged, so as to allow the lumbar-back to slide or lower at will.

I'Iavin g now particularly described and ascertained the nature of mysaid invention and in What manner the same is to be performed, I declarethat What I claim is 1. The combination of a suitable article offurniture having a seat portion, with a fixed back provided withsuitable springs, and a lumbar back having springs of greater strengththan the springs of the fixed back, substantially as set forth.

2. The combination of a suitable article of furniture provided Withracks and a suitable seat portion, With a fixed back provided withsuitable springs and a lumbar-back adjustable upon said racks and havingsprings of greater strength than the sprin of the fixed back,substantially as set forth.

3. The combination of fixed racks, and a spring-seat with a fixed backcomprising springs placed in the direction of the breadth of the back,and a movable cushion covering the back-sprin gs, an adjustablelumbar-back comprisinga rigid portion,flat springs mounted on the rigidportion of such lumbar-back and being stronger than the springs on thefixed back, a movable cushion covering the flat springs, aspring-actuated movable piece hinged to the rigid portion of thelumbarback, and pins which engage the teeth of said racks, substantiallyas shown and described.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing Witnesses.

ARMAND MAUCHAIN.

\Vitn esses:

E. IMER-SCHNEIDER, TH. MERL.

